thank you wledstan,apericiated your response,thats one option(P22) i had given already but a contractor insisting,that 775c is lower critical temp for P11 so if apply 750c for PWHT its convenient.
can u encompass what maximum changes in microstucture can occur if used 750c PWHT for P11/P91...
Hi,
Our contractor is going to weld P11(P4) to P91(P15E), they have PQR but i have still doubt for PWHT,and looking for expert advise.
PWHT is required after welding,and they used 750c holding Temp.however recomended temp from ASMEB31.1 650 to 705 for P11 and 735 to 775 for P91.
my question if...
May i have interperttion of ASME SEC 1 Table PW-11.
We have HRSG (heat recovery steam generator),and in the drawing, designer specifies a limit of ASEM SEC 1 scop and AME B31.1(Power Piping.
my question is:what will be the NDE requirement for Piping fall under ASEM SEC1,As per Table PW-11...
